Is Phentermine or Wegovy pill better for weight loss?

Only Wegovy pill has a trial figure recorded here: 13.6% average weight loss, from its own label trial. Phentermine has none on this site, so the two cannot be compared on effect and this page does not pick one on it.

Which is cheaper, Phentermine or Wegovy pill?

Phentermine publishes no all-in monthly price that could be verified, so this page carries no comparison rather than an estimate — and an unpublished price is itself worth weighing.

Can you switch between Phentermine and Wegovy pill?

They are different molecules, so this is a change of medication rather than of brand, and the one you move to is started on its own dosing schedule.

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Phentermine (generic) vs Wegovy pill (oral semaglutide 25 mg)

Verdict

Neither comes out ahead on the axes compared here. Wegovy pill scores higher on the published halfrx formula, 6.5 against 3.1; the formula takes in more than this table does.

Computed from the stored fields, so it moves when a price does. Nothing here is written by hand or by a model.

Wegovy pill (oral semaglutide 25 mg) or Phentermine (generic): which one has a price?

Only Wegovy pill (oral semaglutide 25 mg) has an all-in figure here: $149–$299 a month, read from its own page on 2026-09-10. No price is published here for Phentermine (generic), so price cannot decide between them. Every axis below is computed from stored fields rather than written by hand, so the comparison moves when a price does. Neither carries an FTC action, a state action, a BBB F grade or an FDA warning letter. One is branded and the other generic, and they are different drugs, so the gap is the molecule as well as the price. The published formula scores them 3.1 and 6.5 out of 10, arithmetic over the same stored fields rather than an editor's preference. Cost here is scored on what a patient pays once titrated, never on the entry price, because an introductory rate covers the months before anybody has reached the dose they stay on.

Head to head

Phentermine (generic) against Wegovy pill (oral semaglutide 25 mg), one row per axis, with the side that wins each axis marked.
What decides it	Phentermine price unverified	Wegovy pill $149–$299/mo
Entry priceNot comparable — Phentermine (generic) publishes no verified all-in price.	not comparable	not comparable
Regulatory and complaint riskNeither carries a lawsuit, an FDA warning letter or a supply-risk flag.	tied	tied

What the trials, the titration and a year actually say

Axis	Phentermine	Wegovy pill
The trial that figure comes from	The label does not carry a modern trial figure; it states in its own words that the usefulness of this class 'should be measured against possible risk factors', and it is not recommended for long-term use.	Study 7 on the label (NCT05564117), 64 weeks: 13.6% mean weight loss on 25 mg once daily against 2.4% on placebo, intention-to-treat.
Maintenance dose	37.5 mg once daily, in the morning	25 mg once daily
Earliest week you reach it	—	week 13
Year one at the published price of every step	No titration prices recorded	$3,338

The year-one figures walk each titration step at its published price and count the twelve 30-day bottles a year holds. The full arithmetic is published.

Go to Phentermine ↗Go to Wegovy pill ↗

What separates these two, price aside

These are different molecules — phentermine against semaglutide — so this is a comparison of two treatments, not of two prices for one.

Multiple generic manufacturers

Phentermine (generic)

3.1

Price unverified

Controlled substanceWeaker moleculeNo published priceStrict dosing rules

Novo Nordisk

Wegovy pill (oral semaglutide 25 mg)

6.5

$149–$299/mo all-in

verified 2026-09-10

Newly approvedStrict dosing rulesBoxed warning

Phentermine (generic)

Pros

+Pharmacies acquire it at $0.068 a tablet, about $2 for a 30-day supply, under the federal NADAC survey. That is what a pharmacy pays, not what it charges you.[2]
+Covered by more Medicaid programs than any GLP-1 — seven states cover an older weight-loss agent while covering no GLP-1 at all.[3]
+One tablet each morning, no injection, no titration schedule beyond a possible half dose.[1]

Cons

−Approved for a few weeks only. Every monthly subscription selling it as ongoing therapy is using it off the label's own duration.[1]
−Schedule IV controlled substance, chemically related to the amphetamines, with the dependence warnings that follow from that.[1]
−Stopping after prolonged high dosing brings extreme fatigue and depression, per the label — which is a hard exit from a subscription that sold it as maintenance.[1]
−No cardiovascular outcome data of the kind the GLP-1s now carry, and contraindicated where blood pressure is uncontrolled.[1]

Sources

Wegovy pill (oral semaglutide 25 mg)

Pros

+13.6% mean weight loss on the label's own 64-week trial, intention-to-treat — the strongest result of any oral weight-loss drug approved to date.[5]
+No injections, no needle disposal, no refrigeration.[4]
+Self-pay from roughly $149/mo direct from Novo Nordisk, against $1,349 list for the injection.[3]
+Same molecule as Wegovy injection, which has years of post-marketing safety data behind it.[4]

Cons

−The $149 headline is the 1.5 mg starting month only. The 4 mg month is $199, and every month from 9 mg up — including the 25 mg dose you stay on — is $299, twice the advertised figure.[1]
−Oral semaglutide has strict dosing conditions — taken on an empty stomach with a small sip of water and nothing else for 30 minutes. Adherence in the real world is worse than in trials, which is why this site uses the label's intention-to-treat 13.6%, counting everyone randomized, and not the 16.6% the paper reports for those who kept taking it.[5]
−Telehealth programs add a membership on top of the drug — Ro and Hims both charge $149 a month on a monthly plan — while Novo sells the pill direct at $149 to $299 depending on dose.
−Its 13.6% in the label's 64-week trial is below the 20.9% tirzepatide reached in SURMOUNT-1 on Zepbound's label; these were separate trials, not a head-to-head.[8]

Sources

Phentermine side effects →Wegovy pill side effects →Phentermine dosage →Wegovy pill dosage →

Comparisons are computed from the fields on each card, not written by hand or by a model, so they change when the data does. Information only, not medical advice. halfrx may earn a commission from some links, which never changes what a comparison says.

Everything on Phentermine

Everything on Wegovy pill

Phentermine against Wegovy pill, answered

Is Phentermine or Wegovy pill better for weight loss?: Only Wegovy pill has a trial figure recorded here: 13.6% average weight loss, from its own label trial. Phentermine has none on this site, so the two cannot be compared on effect and this page does not pick one on it.
Which is cheaper, Phentermine or Wegovy pill?: Phentermine publishes no all-in monthly price that could be verified, so this page carries no comparison rather than an estimate — and an unpublished price is itself worth weighing.
Can you switch between Phentermine and Wegovy pill?: They are different molecules, so this is a change of medication rather than of brand, and the one you move to is started on its own dosing schedule.